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From B R <software.research.w...@gmail.com>
Subject Re: Issue with nodetool clearsnapshot
Date Mon, 05 Mar 2012 18:38:00 GMT
Hi Aaron,

1)Since you mentioned hard links, I would like to add that our data
directory itself is a sym-link. Could that be causing an issue ?

2)Yes, there are 0 byte files of the same numbers
in Keyspace1 directory
0 Mar  4 01:33 Standard1-g-7317-Compacted
0 Mar  3 22:58 Standard1-g-7968-Compacted
0 Mar  3 23:10 Standard1-g-8778-Compacted
0 Mar  3 23:47 Standard1-g-8782-Compacted
...

I restarted the node and it went about deleting the files and the disk
space has been released. Can this be done using nodetool, and without
restarting ?

Thanks.

On Mon, Mar 5, 2012 at 10:59 PM, aaron morton <aaron@thelastpickle.com>wrote:

>   It seems that instead of removing the snapshot, clearsnapshot moved the
> data files from the snapshot directory to the parent directory and the size
> of the data for that keyspace has doubled.
>
> That is not possible, there is only code there to delete a files in the
> snapshot.
>
> Note that in the snapshot are hard links to the files in the data dir.
> Deleting / clearing the snapshot will not delete the files from the data
> dir if they are still in use.
>
>  Many of the files are looking like duplicates.
>
> in Keyspace1 directory
> 156987786084 Jan 21 03:18 Standard1-g-7317-Data.db
> 156987786084 Mar  4 01:33 Standard1-g-8850-Data.db
>
> Under 0.8.x files are not immediately deleted. Did the data directory
> contain zero size -Compacted files with the same number ?
>
> Cheers
>
>
>   -----------------
> Aaron Morton
> Freelance Developer
> @aaronmorton
> http://www.thelastpickle.com
>
> On 5/03/2012, at 11:50 PM, B R wrote:
>
> Version 0.8.9
>
> We run a 2 node cluster with RF=2. We ran a scrub and after that ran the
> clearsnapshot to remove the backup snapshot created by scrub. It seems that
> instead of removing the snapshot, clearsnapshot moved the data files from
> the snapshot directory to the parent directory and the size of the data for
> that keyspace has doubled. Many of the files are looking like duplicates.
>
> in Keyspace1 directory
> 156987786084 Jan 21 03:18 Standard1-g-7317-Data.db
> 156987786084 Mar  4 01:33 Standard1-g-8850-Data.db
> 118211555728 Jan 31 12:50 Standard1-g-7968-Data.db
> 118211555728 Mar  3 22:58 Standard1-g-8840-Data.db
> 116902342895 Feb 25 02:04 Standard1-g-8832-Data.db
> 116902342895 Mar  3 22:10 Standard1-g-8836-Data.db
> 93788425710 Feb 21 04:20 Standard1-g-8791-Data.db
> 93788425710 Mar  4 00:29 Standard1-g-8845-Data.db
> .....
>
> Even though the nodetool ring command shows the correct data size for the
> node, the du -sh on the keyspace directory gives double the size.
>
> Can you guide us to proceed from this situation ?
>
> Thanks.
>
>
>

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